<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            
            <!-- 角色列表区域 -->
            <el-table :data="rolesList" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row v-for="(item1,i1) in scope.row.children" :key="item1.id" :class="['bdbottom',i1 === 0 ? 'bdtop' : '',vcenter]">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @click="removeRightById(scope.row,item1.id)">{{ item1.authName }}</el-tag>
                               <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过 for 循环 嵌套渲染二级权限 -->
                                <el-row v-for="(item2,i2) in item1.children" :key="item2.id" :class="[i2 === 0 ? '' : 'bdtop','vcenter']">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @click="removeRightById(scope.row,item2.id)">{{item2.authName }}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warnig" v-for="(item3,i3) in item2.children" :key="item3.id" closable @click="removeRightById(scope.row,item3.id)">{{ item3.authName }}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                        <pre>

                        </pre>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column lobel="角色名称" prop="roleName"></el-table-column>
                <el-table-column lobel="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column lobel="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        
        <!-- 分配权限的对话框 -->
        <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
 data() {
    return {
        // 所有角色列表数据
        rolesList:[],
        // 控制分配权限对话框的显示与隐藏
        setRightDialogVisible:false,
        // 所有权限的数据
        rightslist:[],
        // 树形控件的属性绑定对象
        treeProps:{
            label:'authName',
            children:'children'
        },
        // 默认选中的节点id值数组
        defKeys:[],
        // 当前即将分配权限的角色id
        roleId:''
    }
 },
 created() {
    this.getRolesList()
 },
 methods: {
    // 获取所有角色列表
    async getRolesList() {
        const {data:res} = await tshi.$http.get('roles')
        if(res.meta.status !== 200){
            return this.$message.error('获取角色列表失败')
        }
        this.rolesList = res.data

    },
    // 根据id删除对应的权限
    async removeRightById(role,rightId) {
        // 弹框提示用户是否要删除
        const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if(confirmResult !== 'confirm') {
            return this.$message.info('已取消删除')
        }
        const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if(res.meta.status !== 200) {
            return this.$message.error('删除权限失败')
        }
        // 删除成功弹出提示
        this.$message.success('删除权限成功')
        // 重新获取所有角色列表数据
        role.children = res.data
    },
    //展示分配权限的对话框
    async showSetRightDialog(role) {
        this.roleId = role.id
    // 获取所有权限的数据
    const {data:res} = await this.$http.get('rights/tree')
       
    
    if(res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
    }
    // 把获取到的权限数据 保存到data中
    this.rightslist = res.data
    console.log(this.rightslist);
    
    // 递归获取三级节点的id
    this.getLeafKeys(role,this.defKeys)

    this.setRightDialogVisible = true 
    },
    // 通过递归的形式，获取角色下所有三级权限的id，并保存到 defKeys 数组中
    getLeafKeys(node,arr) {
        // 如果当前node节点不包含 children 属性，则是三级节点
        if(!node.children) {
            return arr.push(node.id)
        }

        node.children.forEach(item => this.getLeafKeys(item,arr))
    },
    // 监听分配权限对话框的关闭事件 
    setRightDialogClosed() {
        // 为defKeys 清空 防止下次打开对话框时 里面还有上次的选中数据
        this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
        const keys = [
            ...this.$refs.treeRef.getCheckedKeys(),
            ...this.$refs.treeRef.getHalfCheckedKeys()
        ]
        const idStr = keys.join(',')
        const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
        if(res.meta.status !== 200) {
            return this.$message.error('分配权限失败')
        }
        this.$message.success('分配权限成功')
        this.getRolesList()
        this.setRightDialogVisible = false
    },
 }
}
</script>

<style lang="less" scoped>
.el-tag {
    margin:7px
}
.bdtop{
    border-top: 1px solid #eee;
}

.bdbottom{
    border-bottom: 1px solid #eee;
}
.vcenter {
    display: flex;
    align-items: center;
}
</style>